wc.DownloadFile(fileurl.ToString(), @"D:/" + filename);
{
HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse myWebResponse = (HttpWebResponse)myWebRequest.GetResponse();
Stream readStream = myWebResponse.GetResponseStream();
System.Drawing.Image image = System.Drawing.Image.FromStream(readStream);
// TODO 應該新建對象
//System.Drawing.Image tif = image;
// 獲取圖片頁數
Guid guid = (Guid)image.FrameDimensionsList.GetValue(0);
FrameDimension dimension = new FrameDimension(guid);
int pages = image.GetFrameCount(dimension);
// 保存圖片類型 -> tif
ImageCodecInfo codeInfo = GetEncoder(ImageFormat.Tiff);
// 保存參數
System.Drawing.Imaging.Encoder saveEncoder = System.Drawing.Imaging.Encoder.SaveFlag;
EncoderParameters parameters = new EncoderParameters(1);
// 參數-指定爲多頁
parameters.Param[0] = new EncoderParameter(saveEncoder, Convert.ToInt32(EncoderValue.MultiFrame));
// 保存第一頁
image.Save(@"C:/1.tif", codeInfo, parameters);
// 參數-添加頁面
parameters.Param[0] = new EncoderParameter(saveEncoder, Convert.ToInt32(EncoderValue.FrameDimensionPage));
// 保存後續頁面
for (int i = 1; i < pages; i++)
{
image.SelectActiveFrame(dimension, i);
image.SaveAdd(image, parameters);
}
// 所有頁面保存完畢
parameters.Param[0] =new EncoderParameter(saveEncoder, Convert.ToInt32(EncoderValue.Flush));
image.SaveAdd(parameters);
readStream.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
{
ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
foreach (ImageCodecInfo codec in codecs)
{
if (codec.FormatID == format.Guid)
{
return codec;
}
}
return null;
}